CVE-2026-56208

firefox: Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability. Secu...

CVE-2026-56208 is fixed in 16 products on 1 platform, first by aom-tools 3.3.0-1ubuntu0.1+esm1, released June 19, 2026. It is not reported as exploited. Patch Radar priority: High.

High
CVSS
8.8
Important
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0045
39th percentile

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability. Security Fix(es): * libaom: libaom: heap buffer overflow in AV1 encoder first-pass stats buffer via LAP mode (CVE-2026-56208) * firefox: thunderbird: Site isolation issue in the DOM: Navigation component (CVE-2026-15719) * firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component (CVE-2026-15718) * firefox: thunderbird: Mitigation bypass in the Enterprise Policies component (CVE-2026-16390) * firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: cubeb component (CVE-2026-16350) * firefox: thunderbird: Information disclosure in the Storage: IndexedDB component (CVE-2026-16391) * firefox: thunderbird: Site isolation issue in the Networking: HTTP component (CVE-2026-16375) * firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-16356) * firefox: thunderbird: JIT miscompilation in the JavaScript: WebAssembly component (CVE-2026-16363) * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.13 and Firefox 153 (CVE-2026-16412) * firefox: thunderbird: Same-origin policy bypass in the Networking: DNS component (CVE-2026-16381) * firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-16355) * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.38 and Firefox ESR 140.13 (CVE-2026-16361) * firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-16352) * firefox: thunderbird: Incorrect boundary conditions in the JavaScript: WebAssembly component (CVE-2026-16368) * firefox: thunderbird: Mitigation bypass in the PDF Viewer component (CVE-2026-16377) * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.38, Firefox ESR 140.13 and Firefox 153 (CVE-2026-16360) * firefox: thunderbird: Use-after-free in the WebRTC: Audio/Video component (CVE-2026-16362) * firefox: thunderbird: Site isolation issue in the Graphics: WebRender component (CVE-2026-16358) * firefox: thunderbird: Site isolation issue in the Networking component (CVE-2026-16387) * firefox: thunderbird: Same-origin policy bypass in the DOM: Navigation component (CVE-2026-16349) * firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-16357) * firefox: thunderbird: Sandbox escape due to use-after-free in the DOM: Navigation component (CVE-2026-16351) * firefox: thunderbird: Privilege escalation in the DOM: Navigation component (CVE-2026-16371) * firefox: thunderbird: Privilege escalation in the DOM: Content Processes component (CVE-2026-16379) * firefox: thunderbird: Information disclosure in the Graphics: ImageLib component (CVE-2026-16354) * firefox: thunderbird: Information disclosure in the Framework component in DevTools (CVE-2026-16374) * firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: GMP component (CVE-2026-16359) * firefox: thunderbird: Mitigation bypass in the DOM: Networking component (CVE-2026-16383) * firefox: thunderbird: Integer overflow in the JavaScript: WebAssembly component (CVE-2026-16369) * firefox: thunderbird: Invalid pointer in the DOM: Bindings (WebIDL) component (CVE-2026-16353) * firefox: thunderbird: Privilege escalation in WebExtensions (CVE-2026-16396) * firefox: thunderbird: Information disclosure in the Networking: WebSockets component (CVE-2026-16405) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Where it's fixed

ProductFixed inFixReleased
Linux
SVT-AV1 · sles 15.6 1.8.0-150600.3.2.5 SUSE-SU-2026:3224-1 Jul 23, 2026
SVT-AV1 · sles 15.7 1.8.0-150600.3.2.5 SUSE-SU-2026:3224-1 Jul 23, 2026
aom · Debian 12.15 (bookworm) 3.6.0-1+deb12u3 DEBIAN-CVE-2026-56208 Jun 19, 2026
aom · Debian 13.5 (trixie) 3.12.1-1+deb13u1 DEBIAN-CVE-2026-56208 Jun 19, 2026
aom · Debian 14 3.14.1-1 DEBIAN-CVE-2026-56208 Jun 19, 2026
aom · Fedora 43 3.15.2-1.fc43 FEDORA-2026-FD075F5751 Nov 7, 2026
aom-debuginfo · Fedora 43 3.15.2-1.fc43 FEDORA-2026-FD075F5751 Nov 7, 2026
aom-debugsource · Fedora 43 3.15.2-1.fc43 FEDORA-2026-FD075F5751 Nov 7, 2026
aom-tools · Ubuntu 22.04.1 LTS (jammy) 3.3.0-1ubuntu0.1+esm1 aom-tools 3.3.0-1ubuntu0.1+esm1 Jun 19, 2026
aom-tools · Ubuntu 24.04.5 LTS (noble) 3.8.2-2ubuntu0.2 aom-tools 3.8.2-2ubuntu0.2 Jun 19, 2026
aom-tools · Ubuntu 26.04.1 LTS (resolute) 3.13.1-2ubuntu0.1 aom-tools 3.13.1-2ubuntu0.1 Jun 19, 2026
firefox · RHEL 10 140.13.0-1.el10_0 RHSA-2026:54181 Jul 31, 2026
firefox · RHEL 8 0:140.13.0-1.el8_10 RHSA-2026:47105 Jul 31, 2026
firefox · RHEL 9 0:140.13.0-1.el9_8 RHSA-2026:47104 Aug 5, 2026
firefox · almalinux 8 140.13.0-1.el8_10.alma.1 ALSA-2026:47105 Jul 28, 2026
firefox · almalinux 9 140.13.0-1.el9_8.alma.1 ALSA-2026:47104 Jul 28, 2026
firefox · amzn 2023 140.12.0-1.amzn2023.0.1 ALAS2023-2026-1928 Jul 6, 2026
firefox · ol 8 0:140.13.0-1.0.1.el8_10 ELSA-2026-47105 Jul 28, 2026
firefox · ol 9 0:140.13.0-1.0.1.el9_8 ELSA-2026-47104 Jul 29, 2026
firefox · rocky 8 0:140.13.0-1.el8_10 RLSA-2026:47105 Jul 29, 2026
firefox · rocky 9 0:140.13.0-1.el9_8 RLSA-2026:47104 Aug 3, 2026
firefox-debuginfo · amzn 2023 140.12.0-1.amzn2023.0.1 ALAS2023-2026-1928 Jul 6, 2026
firefox-debugsource · amzn 2023 140.12.0-1.amzn2023.0.1 ALAS2023-2026-1928 Jul 6, 2026
firefox-x11 · RHEL 9 0:140.13.0-1.el9_8 RHSA-2026:47104 Aug 5, 2026
firefox-x11 · almalinux 9 140.13.0-1.el9_8.alma.1 ALSA-2026:47104 Jul 28, 2026
firefox-x11 · ol 9 0:140.13.0-1.0.1.el9_8 ELSA-2026-47104 Jul 29, 2026
libaom · Fedora 43 3.15.2-1.fc43 FEDORA-2026-FD075F5751 Nov 7, 2026
libaom · opensuse-leap 16.0 3.11.0-160000.3.1 OPENSUSE-SU-2026:21061-1 Jun 25, 2026
libaom · sles 15.6 3.7.1-150600.3.9.1 SUSE-SU-2026:3224-1 Jul 23, 2026
libaom · sles 15.7 3.7.1-150600.3.9.1 SUSE-SU-2026:3224-1 Jul 23, 2026
libaom · sles 16.0 3.11.0-160000.3.1 SUSE-SU-2026:22369-1 Jun 25, 2026
libaom-debuginfo · Fedora 43 3.15.2-1.fc43 FEDORA-2026-FD075F5751 Nov 7, 2026
libaom-devel · Fedora 43 3.15.2-1.fc43 FEDORA-2026-FD075F5751 Nov 7, 2026
libaom-devel-doc · opensuse-leap 16.0 3.11.0-160000.3.1 OPENSUSE-SU-2026:21061-1 Jun 25, 2026
libaom-devel-doc · sles 15.6 3.7.1-150600.3.9.3 SUSE-SU-2026:3224-1 Jul 23, 2026
libaom-devel-doc · sles 15.7 3.7.1-150600.3.9.3 SUSE-SU-2026:3224-1 Jul 23, 2026
libaom-devel-docs · Fedora 43 3.15.2-1.fc43 FEDORA-2026-FD075F5751 Nov 7, 2026
libaom3 · Ubuntu 22.04.1 LTS (jammy) 3.3.0-1ubuntu0.1+esm1 libaom3 3.3.0-1ubuntu0.1+esm1 Jun 19, 2026
libaom3 · Ubuntu 24.04.5 LTS (noble) 3.8.2-2ubuntu0.2 libaom3 3.8.2-2ubuntu0.2 Jun 19, 2026
libaom3 · Ubuntu 26.04.1 LTS (resolute) 3.13.1-2ubuntu0.1 libaom3 3.13.1-2ubuntu0.1 Jun 19, 2026
libyuv · sles 15.6 20230517+a377993-150600.3.4.2 SUSE-SU-2026:3224-1 Jul 23, 2026
libyuv · sles 15.7 20230517+a377993-150600.3.4.2 SUSE-SU-2026:3224-1 Jul 23, 2026

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